Telephony.



I. KI-TSEE.

TELEPHONY. APPLICATION. nmm NOV. 22, 1905.

Patented Mar. 2, 1909.

UNITED STATES PATENT OFFICE.

ISIDQR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOWILLIAM J. LATTA, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONY.

Specification of Letters Patent.

Patented March 2, 1909.

Application filed. November 22, 1905. Serial No. 288,549.

To all whom it may concern:

Be it known that I, Isinon Kirsnn, a citizen of the United States,residing at Phila delphia, in the State of Pennsylvania, have inventedcertain new and useful Improvements in Telephony, of which the followingis a specification.

My invention relates to an improvement in telephony, and has particularreference to the telephone circuit extending between stations.

It is the object of my invention to provide sources of inductanceatintervals along the line circuit and to improve the action of eachinductance over the action of an inductance having a normallyunmagnetized core.

For an illustration of my invention, reference may be had to theaccompanying drawing, where A and A represent two telephone stationsjoined by the line wire or conductor L. Each terminal station comprisesan induction coil (Z, whose secondary (Z is connected in the linecircuit along with the usual receiver R. The induction coil primary (Z'is connected with the usual microphonic or other transmitter a and thesource of energy 5.

At intervals in the line conductor L are serially connected inductancecoils F having cores F. These cores F may be permanent magnets, but bypreference they are not in themselves permanently magnetized, but arepermanently magnetized by the external permanent magnets I? I have foundthat from the use of inductances at intervals in a telephone circuitwhen the inductance cores are thus permanently magnetized, there resultsan improvement in the transmission of speech. I am aware that inductance coils have been inserted at intervals in the telephonic line, butthe cores of such inductances have invariably been, I believe, notnormally magnetized. I am aware that for the purposes of resonance inshort circuits where lumped capacity is employed, it has been proposedto normally magnetize an inductance core. But my invention resides in along telephone circuit in which inductances are inserted at intervals,the cores of such inductances being normally magnetized, noresonanceeffects occurring in such a case, inasmuch as the voicecurrents are always changing in frequency, the frequencies extendingover a very wide range.

lVhat I claim is:

1. In a telephone system, a line circuit connecting a plurality ofstations, telephone transmitting and receiving apparatus associated withsaid line circuit at said stations, a plurality of loading inductancesinserted at intervals in said line circuit between stations, and coresfor said inductances normally magnetized independently of the currenttransmitted over said line circuit.

2. In a telephone system, a line circuit connecting a plurality ofstations, telephone transmitting and receiving apparatus associated withsaid line circuit at said stations, a plurality of inductance coilsinserted in said line circuit between stations at practically regularlyrecurring intervals, and cores for said inductance coils normallymagnetkzed independently of the telephonic currents transmitted oversaid line circuit.

3. In a telephone system, a line circuit connecting a plurality ofstations, telephone transmitting and receiving apparatus associated withsaid line circuit at said stations, a plurality of loading inductancesconnected in series in said line circuit between stations and atsuitable intervals, and cores for said inductances normally magnetizedby permanent magnetism and independently of cur rent transmitted oversaid line circuit.

4. In a telephone system, a line circuit connecting a plurality ofstations, telephone transmitting and receiving apparatus associated withsaid line circuit at said stations, a plurality of loading inductancesincluded in said line circuit atintervals between sta- ISIDOR KITSEE.

Witnesses ALvAH Rrr'rnNHoUsE, MARTHA BONNER.

